The Ra-02 LoRa board is manufactured by Ai-Thinker, the maker of the ESP32S board. It uses the SX1278 IC and operates at a frequency of 433MHz. It is a high-quality board with very small dimensions, just 17 x 16 mm, with all the pins of the SX1278 available.

The SX1287 transceivers feature the long-range LoRa™ modem, which provides communication over very long distances with high tolerance to interference while minimizing power consumption. Using Semtech's LoRa™ modulation technique, the SX1287 can achieve sensitivity of over -148dBm with low-cost crystals and materials. The high sensitivity combined with the integrated power amplifier of +20 dBm offers top-tier connection budgets, making it ideal for any application requiring range or resilience. LoRa™ also provides significant advantages over traditional modulation techniques, solving traditional compromise issues between range, interference resilience, and power consumption.

• LoRa™ communication with spread spectrum
• +20dBm - 10mW. Stable RF output power with changes in input voltage
• Half-duplex SPI communication
• Programmable bit rate of up to 300kbps
• Supports FSK, GFSK, MSK, GMSK, LoRa™ and OOK Modulation Modes
• 127dB RSSI signal range.
• Automatic RF signal detection, CAD mode, and ultra-fast AFC
• With 256 bytes CRC data mechanism
• Half hole (castellated hole) SMD package
• With metal shielding
• Pin spacing: 2.0 mm

Specifications:

• Certification: FCC/CE
• Wireless Standard: 433MHz
• Frequency Range: 420 - 450MHz
• Interface: SPI/GPIO
• Operating Voltage: 1.8 - 3.7V, default 3.3V
• Operating current, receive: less than 10.8mA (LnaBoost off, Band 1) transmission: less than 120mA (+20dBm), Sleep Model: 0.2uA
• Operating temperature: -40 - +85 degrees.